We were using virtual texture lightmaps in 4.24, we just updated to 4.25 and all our lightmaps are broken and we can only bake lighting that works by turning off virtual texture for lightmaps in the project settings.
The results with virtual texture on are basically as if there were no shadows at all, and no global illumination. Very harsh lighting with generally incorrect data (random colors on strange surfaces). Any chance this is related to the UDIM bug I am seeing posts about above (do lightmaps use UDIM under the hood)? I bugged it from the editor, but curious if this is a known issue. Thanks.